Transmitter-casing.



F. GOTTSGHALK. TRANSMITTER CASING.

APPLICATION FILED FEBJZ, 1912.

Patented Dec. 3, 1912.

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TRANSMITTER CASING.

APPLICATION FILED FEB.12, 1912.

1,045,96?'. Patented Dec.3,1912.

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1,045,967." sp'ecificationofitiexssatena Patentednea 'syia ei Application filedFebruary 12, 1912. Serial No; 677,112.

To on whom it may concerns Be it known that I, FELIX GO'I'ISCHALK, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Transmitter-Casings, of which the following is a specification, reference being had to the accompanying drawing.

This invention relates to telephone transmitters and particularly to an improved form of that part of the transmitter casing which supports the variable resistance cell, and consists of an arrangementwhereby the adjusting screw employed for holding the cell stem is protected from mechanical injury, or corrosion due to the presence of air or moisture. This is accomplished by providing an air and water-tight cover for the screwand by otherarrangements hereinafter described.

I further provide a terminal for the circuit connecting cord or wire, which is very secure mechanically and which isformed in the same piece as the cell support, thereby between the cell and the terminal.

Itis obvious that my invention can be used with transmitters of any well-known construction, the result being that many small parts are eliminated and a more compact and eflicient structure secured. Figure 1 is a front view of a transmitter embodying this tions removed. Fig. 2, is a cross sectional view through the transmitter. Fig. is a detail of the front plate of the transmitter, with a portion of same broken away to show its interior construction. Fig. 4, is adetail of a means for connecting the diaphragm to the cell of the transmitter. Fig. 5, is a detail of the casing with a portion broken away. Fig. 6, is a detail of the terminal block, and, Fig. 7, is a detail of the diaphragm and its packing.

Like figures of reference denote the same arts wherever they are shown.

1 denotes the casing usually used in transmittersespecially those of the semi-waterproof type.

1 Q is the usual sound receiving diaphragm which is often provided with the resilient pacln'ng 3. i 4; is a 'front plate carrying the mouths piece, this'front plate being secured to the invention with several por- I casing in'any'convement manner. ,A small strip of metal 5 serves to form an electrical connectlon between the dlaphragm and the casing by bridging across the resilient pack- Heretofore it' has been customary to carry the circuit from the front electrode of the usual cell 6 to an insulated terminal, conveniently mounted on the casing by means of a fine wire, which is a fruitful source of trouble. I obviate this. by providing block 7 which is bored outto accommodate the stem 8 of the cell, and which is secured to the casing by screws 9, 10,11 and 12 placed in bushings which insulate them from 7 in any suitable manner. vided for sealing the joint between 7 and 1, thereby inclosing the cell in a tight chamber.

To further provide against the ingress of moisture and to prevent tampering with the cell adjustment, I provide the screw ll having the packing 15, which closes the hole 16, in which is placed the usual adjusting screw 17. Block 7 also carries a suitable terminal 18 for the circuit connection 19.

The circuit through the instrument is from the casing to the diaphragm through the piece 5, then through resistance cell 6 to block 7 and circuit connection 19, all fine wires or loose connections being avoided.

I claim:

1. In a telephone transmitter, an aper- Packing 13 is pro-' tured front plate, a diaphragm positioned back of said front plate, a cell support back of said diaphragm, a resistance cell in said support, an adjusting screw for said cell, an aperture in said cell support for said adjusting screw and means comprising a screw and water tight packing therefor for closing said aperture and covering said adjusting screw.

2. In a telephone transmitter, a casing having an aperturedfront, a diaphragm in said casing, a cell support positioned at the reverse sideof the diaphragm from the apertured front of said casing, butcarried thereby and insulated therefrom, a resistance cell carried by said support, an aperture in said cell support communicating with the stem of said cell, adjusting means for said stem in said aperture, a screw in said aperture above said adjusting means and water tight packing around said screw.

3. In a telephone transmitter, a casing having all rearwardly. projecting apertured flange, a cell support mounted On and insutight, packing surrounding its head, and a 10 lated from said flange, a transmitter cell terminal carried by said support. carried by said support and projecting into "In testimony whereof I hereunto afiizrmy said apertured casing, a diaphragm, means signature in the presence of two Witnesses.

. connecting-said diaphragm to said cell resilient packing between said diaphragm andl FELIX GOTTSCHALK' said casing, an adjusting screw in said sup- Witnesses: port, and means for covering said adjusting H. G. TORREY,

screw comprising a screw having Water CHARLES TAYLOR. 

